# NousResearch/hermes-agent · DeepSeek thinking/reasoning config causing API errors

## Open now

- 1 issue, 0 PRs open on GitHub.
- #30818: \[Bug\]: DeepSeek provider returns HTTP 400 on first message with deepseek-v4-flash (v0.14.0)

Issues and fixes around DeepSeek's thinking and reasoning_effort parameters causing HTTP 400 errors, including making extra_body.thinking opt-in and mapping effort levels to API spec.

## TL;DR

- 3 member(s): 1 open issue(s), 0 closed issue(s), 0 open PR(s), 0 merged PR(s), 2 PR(s) closed without merging.
- No fix has been merged to main; one or more PRs were attempted (see below).
- **Recommended:** review the prior/competing PR(s) below. A fix was attempted but not merged; your case may extend or revive that work.

## Maintainer resolution verdict

- Internal-tracker verdict over this cluster's issue members: `unresolved`. This is distinct from the fix status above. Weigh it yourself.

## How this cluster was grouped

- Link evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.
- Pairwise link density `0.67`: the share of member pairs that carry a link, counting a structural link in full and a relevance-only link at 0.36. `1.00` means every pair is linked.

## Open related issues

- #30818: \[Bug\]: DeepSeek provider returns HTTP 400 on first message with deepseek-v4-flash (v0.14.0)

## Prior & competing PRs

- **#30832: fix(deepseek): make extra_body.thinking opt-in to unblock V4 first call (#30818)**. closed without merge
  - maintainer direction: category `uncategorized`; implication `needs_llm`; refs `#30818`, `#26648`, `#28945`
- **#30883: fix(deepseek): map low/medium reasoning_effort to high per API spec**. closed without merge
  - maintainer direction: category `duplicate_of`; implication `duplicate`; refs `#28945`, `#16448`, `#21052`, `#22218`

## Fix status

- No merged fix on record.
- Subsystem: `agent`